This rare Mercedes 300SL 'Sportabteilung' Gullwing will be going under the hammer at RM Sotheby's New York sale on 10th December.
Whilst it's a beautiful car, and one of only four special race-prepared versions that were made, its value is set to be boosted further by the fact that Sir Stirling Moss drove it to second place in the 1956 Tour de France - losing out to Marquis de Portago in his Ferrari 250 GT.
The 1955 car, which is capable of more than 160mph, was purchased by the vendor's father who drove it for two years then put it into storage for the next 40 years. The son, the current owner, has since spent three years restoring it to its Tour De France spec.
Experts estimate that it could fetch as much as £5 million when it goes under the hammer, as Sir Stirling Moss' cars are now among the most sought-after cars in the world.
Alain Squindo, Vice President, RM Sotheby, said: 'This car illustrates an important and lesser-known chapter in the Gullwing racing legend. Not only is it rarer than the ever desirable alloy-bodied Gullwings, but its desirability is amplified by its astonishing provenance.
'None other than Sir Stirling Moss drove the car to a second place finish at the '56 Tour de France, beaten only by de Portago in his Ferrari, which RM sold for a world record $13.2 million in Monterey earlier this year.
'It begs the consideration of any serious collector in search of the ultimate Gullwing for their stable.'